The behavior of the radiator cooling fan in your car can vary depending on the design and control system of the vehicle. In some cars, the radiator cooling fan may continue to run even after the air conditioning (AC) is turned off, while in others, it may not. There are several reasons why this might be the case:
Temperature Control: The cooling fan in your car's radiator is primarily designed to cool the engine when it reaches a certain temperature. It is controlled by a thermostat or a temperature sensor. If the engine is hot and needs additional cooling, the fan will continue to run even after you turn off the AC. Once the engine temperature drops to a certain level, the fan may stop running.
Auxiliary Fan: Some vehicles have an additional electric fan or fans that work in conjunction with the radiator cooling fan. These auxiliary fans may be controlled separately and might continue to run after turning off the AC to provide extra cooling if needed.
Delayed Shutdown: In some vehicles, the cooling fan may continue to run for a short period after turning off the ignition. This feature allows the engine to cool down gradually and can help prevent overheating.
Faulty Fan Relay: If the radiator cooling fan does not run at all, it could be due to a faulty fan relay, temperature sensor, or wiring issue. A malfunctioning fan control system can prevent the fan from operating correctly.
Vehicle Design: The behavior of the cooling fan might also be influenced by the vehicle's design and the manufacturer's specifications. Different car models can have varying cooling fan control strategies.
To determine the specific reason why your radiator cooling fan behaves this way, it's best to consult your car's owner's manual or contact a qualified mechanic or dealership. They can inspect the cooling fan system, identify any potential issues, and ensure that the fan is operating as intended to keep your engine cool and prevent overheating.